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[somya]

Hey, is this question in a pastpaper???If so, then which one?

it's not in a past paper, its in the book-Extended Mathematics For IGCSE (by David Rayner)

 

[somya]

uh i guess its 125 instead of 1250.. coz it says tiles of squares 10cm square instead of squares of side 10cm..

hmm... nope, its 125!!

 

[Saahil Parikh]

hmm... nope, its 125!!

err thats what i said..

 

[somya]

err thats what i said..

oops!!
how did yuh find it

 

[xoxoxogaurav123]

it's not in a past paper, its in the book-Extended Mathematics For IGCSE (by David Rayner)

see it takes 4 days for 6 men to dig 3 feet deep
so it will take them (4*7)/3= 9.33 days for 7 feet deep
if 6 men take 9.33 days to dig 7 feet deep
it will take (6*9.33)/10=5.6 days for 10 men to dig 7 feet deep

 

[somya]

THANKS!!

 

[xoxoxogaurav123]

WELCOME

 

[Saahil Parikh]

oops!!
how did yuh find it

i'm not so good at explaining stll i'll try..
100 tiles of 10cm square area= 10*800= 8000cm square total are
they are replaced by tiles which have a sides of length 8cm..
therefore their area is 8*8=64..
therefore 8000/64=125.
hope this helps..

 

[xoxoxogaurav123]

dats rite saahil

 

[somya]

i'm not so good at explaining stll i'll try..
100 tiles of 10cm square area= 10*800= 8000cm square total are
they are replaced by tiles which have a sides of length 8cm..
therefore their area is 8*8=64..
therefore 8000/64=125.
hope this helps..

oh! hey i made a mistake.... the answer should be 1250!!

 

[Saahil Parikh]

oh! hey i made a mistake.... the answer should be 1250!!

why?

 

[Prathmesh Thakkar]

help me out plz!!
1. if it takes 6 men 4 days to dig a hole 3 ft deep, how long will it take 10 men to dig a hole 7 ft deep??

2. a floor is covered by 800 tiles measuring 10 cm square. how many square tiles of side 8 cm would be needed to cover the same floor??

Q 1 ans is 5.6 days
Q ans is in the attachment....

 

[Prathmesh Thakkar]

nope... its 5.6 days!!

YEa i got the method..u want me to upload it.????
N the ans 125 walla file is attached above.....

 

[somya]

t

Q 1 ans is 5.6 days
Q ans is in the attachment....

the answer is supposed to be 1250!

 

[somya]

why?

it's written in the book!

 

[Prathmesh Thakkar]

Ohh i dint see that ur question has been answered already..!!!!!!!!!!!
Nyc work people..!!!!!!

 

[xoxoxogaurav123]

ya area of 1 square = 10*10= 100 cm2
Total area of tiles= 100*800=80000cm2
Number of 8 cm tiles= 80000/(8*8) as area of 1 8cm square is side*side
Answer= 1250 cm2

 

[Prathmesh Thakkar]

t
the answer is supposed to be 1250!

Then there shud be sme mistake in the question yuh asked me....Repeat the question...is it 10 cm sq or 10 cm.?????

 

[Saahil Parikh]

it's written in the book!

have u copied d question correctly?

 

[xoxoxogaurav123]

lol pt